This is a wing print left on our window just like we might leave hand smudges. While a bird clearly hit the window, it survived and flew away.
While Zoe snagged a version of this for her photoblog http://bonegirlpix.wordpress.com/2010/04/18/wing-print-left-on-window/
it warrants words as well. Besides I like the color in this version as it reminds me of a winged Sufi heart.
I’m not sure what led to the color, though I placed a music stand on the other side of the glass to better capture the print and the greens/reds were likely reflected from my side of the glass.